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由于现场农田环境的复杂多变性,红外甲烷传感器所测数据的准确性和稳定性受外界环境温度影响较大,因而由温度造成的浓度测量偏差需要补偿。分析温度对浓度测量的影响,采用温度、浓度控制单一变量法,对同一浓度甲烷标准气体在不同温度下作标定实验,研究红外甲烷传感器输出值随温度变化关系,得到补偿温度影响率,结合补偿数据处理算法得到补偿值。针对不同浓度的甲烷气体,进行温度特性实验和温度补偿数据处理,实验结果表明:温度补偿前最大测量误差为0.2%,经补偿后,甲烷浓度测量值随温度变化较小,误差范围为0~0.02%。补偿后传感器稳定性和准确性得到改善,能检测0~5%浓度甲烷气体,检测精度可达40×10-6,满足对CH4气体实时监测需求。
Due to the complexity and variability of farmland environment, the accuracy and stability of the data measured by the infrared methane sensor are greatly affected by the temperature of the external environment, so the deviation of the concentration measurement caused by the temperature needs to be compensated. The effect of temperature on the concentration measurement was analyzed. The single variable method of temperature and concentration control was used to calibrate the methane gas with the same concentration at different temperatures. The relationship between the output value of the infrared methane sensor and temperature was studied and the influence of compensation temperature was obtained. The data processing algorithm gets the compensation value. The experimental results show that the maximum measurement error before temperature compensation is 0.2%, and the measured value of methane concentration changes little with the temperature after the compensation, the error range is 0 ~ 0.02%. After compensation, the stability and accuracy of the sensor are improved. Methane gas with a concentration of 0-5% can be detected with a detection precision of 40 × 10-6, which meets the real-time monitoring requirement of CH4 gas.